Glubinnoe stroenie, seĭsmichnostʹ i sovremenna︠i︡a de︠i︡atelʹnostʹ Kl︠i︡uchevskoĭ gruppy vulkanov = Deep structure, seismicity and recent activity of the Klyuchevskaya volcanic group : [Sbornik stateĭ] - Ivanov, B. V. (Boris Vladimirovich); Balesta, S. T. (DVN︠T︡S AN SSSR, 1976)